Earth auger



Jan. 20, 1931. H.'BARTENBACH E'r Al. 1,789,399

EARTH AUGER Filed Jan. 5, 1929 INVENTORS Ealleizaau/L BY ,13. www

y I L ATTORNEY Patented Jan. 20, 1931 UNITED;

RERMANRARTENBACH, or rrrrsnunen, REN'NSYLVANImAND JOHN B. sroWArJJJ,` 0E i NEWARK, NEW `IERSEY, AssIGNoRs ro AMERICAN TELEPHONE AND 'rELEGRAr'n COMPANY, A CORPORATION or NEW YORK. 4 i' Y EARTH 'AUGER Application illed'ianuary 5, 1929.- Seria1"No.- 330,448: y

This invention relates to angers, and more particularlyto augers adapted to be used with earth boring apparatus.

An object of the invention consists of an auxiliary device for an auger which will facilitate and increase the eectiveness of the operation of the auger.

Another object of the'invention consists in the provision of a bladewhich may be quickly attached to and detached from the auger.

A further object is to provide a blade which is simple'and comparatively `linexpensive, and which is adapted to be reversed to give double use before sharpening is necessary.

Theseand otherV objects will be apparent from the following description, when considered in connection withthe accompanying drawing, in which one -embodiment of the invention is illustrated. f Y

Referring to the drawing, Figure lris an elevation of an auger with the improved blade applied thereto; Fig. 2; is, a.V similar view with the device turned at an angle of from that shown in Fig. 1; Fig. 3 is an end viewof the improved blade; Fig. 4 is a sectional View thereof taken on the line 4 4' of Fig. 5; Fig. 5 is a side elevation of the blade; and Fig. 6 is a bottom view thereof.

In the drawing, in which like characters designate like parts throughout, 5 indicates a shank of tubular formation which is slightly tapered toward its lower portion. end of a shaft 6 extends within the chamber in the upper portion of the shank 5 and is secured thereto by means of a bolt 7 This bolt passes through openings provided in the shaft and shank and a cotter-pin may be inserted through the extended end of the bolt to maintain it in position. The end of the shaft' which isipositioned in the lower part of the chamber portion ofthe shank 5 may be round in'cross-section, while the portion of the shaft positioned in the Vchamber andV terminating at the collar 8 of the shank may be square, in accordance with well-known construction. The shaft 6 may-be connected to apparatus from which power -is derived for the purpose of rotating the auger in its boring operation. Y

i spiral portion l or helix formedabout the'shank 5 vand extends downwardly from:

the collar 8. f This helix v is shown'as having a lie-enforcing edge or flange lOwhichprof jects downwardly therefrom. rAthrust .plate l1 which forms a cutting lip for Vtheau'gercontinues from-a. point adjacent-the termiv nation of the flange 10 and issecured tothehelix 9 by'bolts 1 2, as moreclearly shown 'inf Fig. l." The thrust platell is provided forH the purpose `of keeping the auger centeredf'in the hole byv vpreventing the thin ledgesfof. vthe helix from being pressed yinto the compara-V tively soft material at the side ofthe hole,'ldue l to the actionofthe cutting blade, to 'be presently described, whichoperatesf lon onlyfvv one side ofthe center point.V Theend ofthevhelix 9fis of a somewhat circular formation Y and has alongitudinal .rslot113 provided'v through its wall which, extends in an angular direction of approximately 45 fand may be' provided Vwith a round terminatingwfhead.. portion; The slot 13 visadapted to receive a Vsubstantiallyrectangular augerl blade@ 14, whichfmay be secured in said slot. by mean/s of detachable'bolts 15 which pass throughA openings in 'the blade and in the end of the' helix 7 9. These-boltsfmay have'cotter-pins applied through holes provided in theirprojectingends to retainthe boltsYV in position. It ispreferred that the bolts be so positioned that thecotter-pins will be on the opposite side of the helix 9 from that coming incontact'withthe material being bored intoin order Vthat the-'wear on the said "cotter-'pins will bel negligible, during the boring .operation. The blade 14 is shown as havingfa ilat top surface in the form-cfa parallelogram whose end yportions are V.beveled in a parallel directionand the; sides of thelblade. 14 may be substantially flat through their major portion. An angular slot 16 is cut through the `bottom of the flat side portions at the approximate center thereof and'beveled pori tionsterminating in cutting points 17 and 18 are formed on Yeach side of the slot. These beveledportions may be of substantially tri,-V

the provision of the angular slot 1 6 between,

Vangular shape in vertical cross-section andr 'LUL 2 K e Y y 1,789,399

ipresent parallel inclined surfaces. The forother section being similarly operative on' mation of the slot in the manner described the reversed position of the blade.

permits such dislodged material as may In testimony whereof, I have signed my gather at this point during the drilling opername to this specification this 81st day of ation to be discharged ove-r the bladefand be December, 1928.: f depositdon the upper surface ofthe helix, yH R ANfBAR'IENBAGI-I. 70V from whence it travels upwardly in a welle.. Intestimonywhereof, I have signed my known manner. VThe formation ofthe'slot, name to this peciiication this 10thv day of,

asdescfribed, Aalsoperlnits the division `of "the December, 1928: blade in two" cutting sections'. The portion j 17 as shown mounted in F ig. 2 performs the" major cutting operation, while the section ,l 18 contributes only slightly in this respect, as the auger point, to be, presentlydescribdf r z has already dislodgedthe earth which the section l'couldlreach: The'xp'rovisionofthe blade 14.1Y formsl an auxiliar'ycutting edge which loo-*operates with` they auger. pointgV and Y" increases` the diameter. ofthe holeifbeing!V L, bored. .After the :cutting section 17 has bei come dull, the blade 14 may-be readily re-l 85 mov-ed" by detaching the pins, 15 froin'thev I helix; 'lheblade may be then removedfandl f f l reversedso thatthe cutting: sectionli may lslot for-med at' theendof'the shank ,fandis i fsecured f thereto by a bolt 20. which extends i 19 is'oflsuitabl-e thicknessr and its' horizontal The auger point. 19 with whichthebiaaeii. l f "0" co-'op'erates isfoflflat. and substantially trip angular. formation, Tandis positioned in asusL through theseelements.=A The Vflat augenpomt top edge projectsV outwardly' from the sur-f face-ofthe shank any desired distance-VerticalY portions may i which the auger blade 14k lies are preferably el provided 'at the ends of the top vedge'vof the auger point19an`dny beveled portions extending therefronl meetv to forma cutting point.. The* slot 'in-whi'ch Y theflatauger'point 19 lies, and the slotfin'v 105 so arranged that the auger point and augerV y bladelie in substantially perpendicular'posif i" withthe auger, may'have its opposite end2 blade-and thrust plate co-op'erate therewith f cured thereto .for rotating the sha-nk, a-helix` i tions with respect to each other'. Y A The'shafu-which is connectedatoneendr connected with .a power shaft orfother appa- '1m ratus to cause the rotation of the auger. The I auger pointl of the improved device oper#A ates i'n a well-known manner, whiletheaugerf and increase the diameter of' the Vh'o'lev being" drill-ed, f 'lV Whatisclaimed is: v. Anauger comprising `a shank, ashaft-selformed on said shank, a" blade'mernberfc'on- 12u nectedto 'said shank, and-a second blademember having a cutting edge adaptedfto be-y reversibly connectedfto said helix and co-o'pfY .v .f

erating. with said firstinentionedblademen# Y 125VY ber, said second "blade member" having an v Va'ngiu'lar slot for dividing itsl cz'utti'ngedge'A o'fauger in one'positionE ofthe blade and the' 1 p Y y i' 

